I was in a four stack earlier and we did this because my friend wanted a screenshot "for the memes" lol. We picked Moira, mercy, Ana, and sym and then the two randoms switched to Lucio and zen. We all switched back to something else before the game started, of course, and it ended up being a really close match but we came back from 99-0 in the last round(it was on ilios) and winning. We all added each other and I haven't enjoyed a match that much in a long time.